Steering device for outboard engine

a technology of steering device and outboard engine, which is applied in the direction of steering rudder, marine propulsion, vessel construction, etc., can solve the problems of large installation space in the body of the boat, unsatisfactory total length from the steering wheel to the helm mechanism, and application of the prior art steering device disclosed, so as to reduce the total length

Inactive Publication Date: 2011-05-19
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]In view of the foregoing prior art problems, it is an object of the present invention to provide an improved steering device for an outboard engine which has

Problems solved by technology

However, the prior art steering device disclosed in JP 2005-231383 A, where the helm mechanism is provided in axial alignment with the steering wheel and assist mechanism, would undesirably have a great total length from the steering wheel to the helm mechanism.
Thus, a relatively great installa

Method used

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  • Steering device for outboard engine
  • Steering device for outboard engine
  • Steering device for outboard engine

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Experimental program
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first embodiment

[0025]FIG. 1 is a plan view of the boat provided with a steering device for an outboard engine according to the present invention. As shown, the outboard engine 10 includes: an outboard engine body 13 mounted to a stern 12 of the body 11 of the boat; a cylinder unit 14 for steering the outboard engine body 13; and the steering device 16 for operating the cylinder unit 14.

[0026]The outboard engine body 13 mounted to the stern 12 of the body 11 of the boat is pivotable in a horizontal left-right direction via a swivel shaft 21. The outboard engine body 13 has an engine 22 provided therein, and a propulsion propeller 23 is connected to the output shaft of the engine 22.

[0027]The cylinder unit 14 includes a steering cylinder 25 provided on stern 12 of the body 11 of the boat, and a rod 28 connecting an arm 27 to a steering piston 26 of the steering cylinder 25. The arm 27 is provided on the outboard engine body 13. The steering cylinder 25 has a left end portion 25a communicating with a...

second embodiment

[0065]Thus, the mechanical helm mechanism 92 can be disposed so as not to project from the lower end portion 48a of the steering output shaft 48 downward in the axial direction of the steering output shaft 48. In this way, it is possible to reduce a total length L2 of the steering device 90 from the steering wheel 37 to the mechanical helm mechanism 92. As a result, the steering device 90 can be constructed in a compact size and thus can be installed in, or applied to, many different types of bodies of boats.

[0066]Further, the second embodiment of the steering device 90 can achieve the same advantageous benefits as the first embodiment of the steering device 16.

[0067]The following describe a third embodiment of the present invention, which is characterized by provision of a power transmission section 100 in place of the power transmission section 44 provided in the first embodiment.

[0068]As shown in FIG. 8, the power transmission section 100 includes an endless chain 102 in place of...

third embodiment

[0071]The power transmission section 100, comprising the chain 102 as set forth above, can transmit the rotation of the steering output shaft 48 to the mechanical helm mechanism 92 with a simplified construction. Thus, the third embodiment can reduce the total length L2 of the steering device from the steering wheel 37 to the mechanical helm mechanism 92, simplify the construction of the power transmission section 100 and reduce the necessary manufacturing cost of the power transmission section 100.

[0072]Furthermore, changing a sprocket ratio (i.e., diameter ratio) between the driving sprocket 103 and the driven sprocket 104 allows the steering angle of the steering wheel 37 to be adjusted appropriately. In this way, the steering angle of the steering wheel 37 can be adjusted optimally in accordance with operability required, for example, when the boat should leave a shore or should reach a shore.

[0073]The following describe a fourth embodiment of the present invention, which is cha...

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Abstract

A steering device for an outboard engine includes: a helm mechanism operable, in response to operation of a steering wheel, to steer the outboard engine and including a drive shaft parallel to an output shaft of the operation member; an electric assist mechanism for detecting steering torque, applied to the steering wheel, to assist operation of the helm mechanism on the basis of the detected steering torque; and a power transmission section for connecting the output shaft of the steering wheel and the helm mechanism to transmit rotation of the output shaft to the helm mechanism.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a steering device for an outboard engine which operates a helm mechanism (steering mechanism) in response to operation of a steering operation member, provided on the body of a boat, so as to steer the outboard engine via the helm mechanism.BACKGROUND OF THE INVENTION[0002]Generally, in boats provided with an outboard engine, a steering wheel or tiller handle is used as s steering operation member of a steering device for steering the outboard engine mounted on a rear end portion of the body of the boat. Among the conventionally-known outboard engine steering devices is one which includes an assist mechanism provided between a steering wheel and a hydraulic helm pump (i.e., helm mechanism), and in which steering force (operating force) of the steering wheel is assisted by the assist mechanism. One example of such a steering device is disclosed in Japanese Patent Application Laid-Open Publication No. 2005-231383 (JP 2005-23...

Claims

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Application Information

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IPC IPC(8): B63H20/12
CPCB63H25/22B63H25/20
Inventor HARADA, YOSHIHIROOKA, KOICHI
Owner HONDA MOTOR CO LTD
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